Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
DRC - Detailing Calculator
A simple to use app to help calculate any dilution ratio
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
12 ratings · Top 30%
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for DRC - Detailing Calculator: map the core Utilities workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Expand to include more detailing services and customizable rates.
Assumption to check: Limited calculation options compared to other apps
Validate with people who use this workflow before building.
Hypothesis 2
Add export options to PDF or CSV for user convenience.
Assumption to check: No export functionality for results
Validate with people who use this workflow before building.
Hypothesis 3
Introduce charts or graphs to visualize cost breakdown.
Assumption to check: No visual breakdown of calculations
Validate with people who use this workflow before building.
Hypothesis 4
Implement a feedback system to gather user suggestions.
Assumption to check: Lack of user feedback options
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
A simple to use app to help calculate any dilution ratio. The Dilution Ratio Calculator (DRC) app is specifically designed for automotive detailing. It will tell you how much water and product you need to get your desired dilution ratio. Simply enter your container size and dilution ratio to get accurate instant results in either Ounces or Milliliters. With the DRC app quickly calculate the amount of water and solution you need wherever you are! Learn what Panel Impact Ratio (PIR) is and how to calculate the right PIR for you. Also has a quick and easy to use Converter to convert Ounces to Milliliters or Milliliters to Ounces. The DRC app also has a dedicated section where you can find a wide variety of products with their dilution ratios. Everything from Detail Spray, Pre-Wash, Shampoo, and Wheel Cleaner. Easy for you to quickly find.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
React Navigation
Async Storage
Axios
Clipboard API
BUILD KIT DIFFICULTY
Starter
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
